Duke and NC State Collaborative Quantum Computing Seminars

Duke & NC State  will host a Collaborative Quantum Computing Seminar Sept 3, 2021!

Talk Title: Quantum computing with rotation-symmetric bosonic codes

Speaker: Josh Combes, University of Colorado, Boulder

Abstract: Bosonic mode error-correcting codes are error-correcting codes where a qubit (or qudit) is encoded into one or multiple bosonic modes, i.e., quantum oscillators with an infinite Hilbert space. In the first part of this talk I will give an introduction to codes that have a phase space translation symmetry, i.e. the Gottesman-Kitaev-Preskill aka GKP, and codes that have a rotation symmetry. Moreover, I will survey the impressive experimental progress on these codes. The second part of the talk I focus on single-mode codes that obey rotation symmetry in phase space, such as the well-known Cat and Binomial codes. I will introduce a universal scheme for this class of codes based only on simple and experimentally well-motivated interactions. The scheme is fault-tolerant in the sense that small errors are guaranteed to remain small under the considered gates. I will also introduce a fault-tolerant error correction scheme based on cross-Kerr interactions and imperfect destructive phase measurement (e.g., a marginal of heterodyne). Remarkably, the error correction scheme approaches the optimal recovery map for Cat and Binomial codes when the auxiliary modes are error-free. We numerically compute break-even thresholds under loss and dephasing, with ideal auxiliary systems.  If time permits I will discuss the search for optimized codes and progress towards genuine fault tolerance.

This is a Hybrid Collaborative Event with NC State and Duke. In Person location for NC State is Venture Place, 2nd Floor, Large Classroom.

REGISTRATION: Form Link 

For more information email:

quantumcomputing@ncsu.edu